20 MHz crystal in the ECX-1637QZ automotive series
The ECS-200-10-37QZ-AES-TR: Load capacitance is specified at 10 pF, and the combined frequency tolerance of ±25 ppm and stability of ±50 ppm over the operating temperature band keeps the accumulated timing error within bounds for ADC/DAC oversampling clocks and low-data-rate serial links that derive bit clocks from the crystal frequency.
AEC-Q200 qualification and temperature grade
ESR is 100 Ω — the higher series resistance relative to a low-ESR processor crystal means the drive circuit must be rated to source the extra power dissipation; verify the oscillator/startup circuit on the target MCU or SoC can reliably start into this ESR at Vdd minimum.
Sourcing and lifecycle
The ECX-1637QZ series positions these as automotive-grade crystals sourced through tape-and-reel or cut-tape packaging; availability and lot-traceability data are confirmed at RFQ.